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If a DNA-coding triplet for an amino acid is TAC, which of the following would be the complementary coding triplet in messenger RNA (mRNA)?

Select one:
A. CAT
B. TUG
C. AUG
D. TAC

Sagot :

GinnyAnsweridn
To determine the complementary coding triplet in mRNA for a given DNA triplet, we need to understand the basic rules of base pairing between DNA and mRNA. DNA is typically double-stranded, but during transcription, the DNA strand is used as a template to produce a single-stranded mRNA molecule.

Here’s the step-by-step process:

1. Identify the DNA triplet:
The given DNA triplet is TAC.

2. Understand the base pairing rules:
DNA and mRNA pair up according to specific rules:
- Adenine (A) in DNA pairs with Uracil (U) in mRNA.
- Thymine (T) in DNA pairs with Adenine (A) in mRNA.
- Cytosine (C) in DNA pairs with Guanine (G) in mRNA.
- Guanine (G) in DNA pairs with Cytosine (C) in mRNA.

3. Apply the base pairing rules to the DNA triplet TAC:
- The first nucleotide in the DNA triplet is T, which pairs with A in mRNA.
- The second nucleotide in the DNA triplet is A, which pairs with U in mRNA.
- The third nucleotide in the DNA triplet is C, which pairs with G in mRNA.

By following these rules, the complementary mRNA triplet for the DNA triplet TAC is:
- T (in DNA) -> A (in mRNA)
- A (in DNA) -> U (in mRNA)
- C (in DNA) -> G (in mRNA)

Therefore, the complementary coding triplet in mRNA is AUG.

Thus, the correct answer is:
O c. AUG
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